motion, its types, vertical motion and horizontal motion
- 2. OBJECTIVES 1. Define speed as distance travelled per unit time and define velocity as change in displacement per unit time 2. Recall and use the equation: speed = distance x time 3. Recall and use the equation: average speed = total distance travelled x total time taken 4. Define acceleration as change in velocity per unit time; recall and use the equation 5. acceleration = change in velocity / time taken a = ∆v/∆t 6. Calculate acceleration from the gradient of a speed–time graph 7. State what is meant by, and describe examples of, uniform acceleration and non-uniform acceleration 8. Know that a deceleration is a negative acceleration and use this in calculations 9. Sketch, plot and interpret distance–time and speed–time graphs 10. Determine from the shape of a distance–time graph when an object is: (a) at rest (b) moving with constant speed (c) accelerating (d) decelerating 11. Determine from the shape of a speed–time graph when an object is: a) at rest (b) moving with constant speed (c) moving with constant acceleration (d) moving with changing acceleration 12. State that the acceleration of free fall g for an object near to the surface of the Earth is approximately constant and is approximately 9.8m/ s2 13. Calculate speed from the gradient of a distance–time graph 14. Calculate the area under a speed–time graph to determine the distance travelled for motion with constant speed or constant acceleration
- 3. SPEED ANDVELOCITY Velocity & speed, has SI units of meters per second (m/s)
- 4. UNIFORM AND NON UNIFORM SPEED
- 5. ACCELERATION Acceleration is defined as The rate of change of velocity with respect to time. Acceleration is a vector quantity as it has both magnitude and direction. It is also the second derivative of position with respect to time. The SI unit of acceleration is given m / Sec
- 6. UNIFORM AND NON UNIFORM ACCELERATION Time (S) Velocity m/ S 1 2 3 4
- 7. NEGATIVE ACCELERATION An object has a negative acceleration if: an object is moving in a positive direction slowing down, or moving in a negative direction and speeding up. But value of acceleration will be negative.
- 8. NEXT PPTWILL BE GRAPHS